Ƙarƙashin kaso mai rarrafe wani muhimmin sashi ne na injuna masu nauyi kamar su tona, tarakta, da na bulldozer.Yana taka muhimmiyar rawa wajen samar da waɗannan injuna tare da motsa jiki da kwanciyar hankali, ba su damar yin aiki yadda ya kamata a wurare daban-daban da yanayin ...
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